2 Answers

Check obvious stuff, like no or low refrigerant, and fuses. Same
problem on my 1991 was the Temperature Blend Actuator, This
controls the door in the plenum which in turn controls which is
sent thru to the cabin.. A/c or Heat.Unfortunately requires a partial
removal of the Dash ( Instrument panel.) Complicated even more
with a passenger airbag.

We turned in our Grand Marquis for the Light Switch recall and noted to the service people that the AC compressor is slow to kick on but once it does, it works fine. They are now tewlli8ng us that it ...

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